Mandatory biochemical blood analysis as a diagnostic standard
In daily clinical practice, there is a strictly regulated list of mandatory biochemical blood tests. This panel is prescribed to patients regardless of their current monitoring regimen, department specifics, or preliminary diagnosis. This fundamental diagnostic list invariably includes determining the activity of two key enzymes: alanine aminotransferase (ALT) and aspartate aminotransferase (AST).
However, the evaluation of these parameters is never performed in isolation. To provide the attending physician with the most complete and objective picture of the patient's internal organ status, the mandatory minimum biochemical test also includes the following crucial parameters:
- Evaluation of serum glucose levels.
- Determination of total bilirubin concentration.
- Measurement of excretory function markers: urea and creatinine.
- Analysis of lactate dehydrogenase (LDH) activity.
Furthermore, depending on specific clinical objectives, this baseline list may be expanded. The evaluation of alkaline phosphatase (ALP) and gamma-glutamyl transferase (GGT) activity is frequently considered as additional parameters.
Specifics of ordering AST and ALT in cytomegalovirus infection (CMV)
Special, close attention is paid to AST and ALT levels in the diagnostic and management protocols for patients with suspected cytomegalovirus infection (CMV).
When a clinician has a well-founded suspicion of a manifest form of CMV, the patient is prescribed a specialized, expanded panel of laboratory tests. This panel invariably includes a general (clinical) urinalysis as well as an expanded general therapeutic biochemical blood test. In this clinical scenario, the parameters mandatory for quantitative evaluation are:
- Enzymes: ALT and AST.
- Additional enzyme markers: gamma-glutamyl transferase (GGT), alkaline phosphatase (ALP), and alpha-amylase.
- Pigment metabolism parameters: not only total bilirubin, but also its individual fractions—free and conjugated bilirubin.
- Nitrogen metabolism parameters: urea and creatinine.
In addition to the biochemical profile, when a manifest form of CMV is suspected, it is critically important to perform a preliminary evaluation of the hemostasis system. For this purpose, a coagulogram is ordered, or the prothrombin (thromboplastin) time in the patient's blood or plasma is precisely determined.
If the manifest form of CMV is already laboratory and clinically confirmed, the diagnostic focus shifts somewhat. The general (clinical) blood count comes to the foreground, in which a differential leukocyte count is invariably performed (a detailed leukocyte formula is compiled) and the platelet level is carefully examined.
The role of AST and ALT in laboratory monitoring and general therapeutic profile
During continuous dynamic monitoring of patient status, the attending physician requires regular and precise laboratory control. This control is traditionally based on two main diagnostic tools: the clinical blood count and the biochemical test. Within standard biochemical monitoring, ALT and AST levels, as well as concentrations of total bilirubin, creatinine, and urea, are mandatorily monitored.
If it is necessary to perform the most complete general therapeutic biochemical blood analysis, an even more detailed and comprehensive profile is formed. The mandatory parameters of this advanced investigation include the evaluation of several body systems simultaneously:
- Protein metabolism parameters: measurement of total protein and albumin concentration.
- Enzyme profile: determination of AST, ALT, lactate dehydrogenase (LDH), and alkaline phosphatase activity.
- Evaluation of pigment metabolism: measurement of total bilirubin levels.
- Nitrogen metabolism markers: quantitative determination of urea and creatinine (uric acid is also added to some test panels).
- Electrolyte balance: mandatory measurement of total calcium and potassium levels in blood serum.
ALT and AST are never evaluated alone in biochemistry: in any baseline analysis, they are always accompanied by Bilirubin, Urea, and Creatinine (the BUC rule).
أسئلة من المحاضرات والامتحانات
Are AST and ALT included in the mandatory list of biochemical tests?
Yes, regardless of the patient's current monitoring regimen, the determination of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) activity is a strictly mandatory component of the basic biochemical blood test.
What other enzymes are tested along with AST and ALT when manifest CMV is suspected?
When a manifest form of cytomegalovirus infection is suspected, in addition to AST and ALT, the levels of gamma-glutamyl transferase (GGT), alkaline phosphatase (ALP), and alpha-amylase are mandatorily evaluated.
What nitrogen metabolism parameters always accompany the AST and ALT tests?
In any of the listed profiles (baseline screening, general therapeutic analysis, monitoring in CMV), urea and creatinine levels are always measured alongside AST and ALT.
مواضيع أخرى للمراجعة في نفس السياق
- Differential laboratory diagnosis of manifest CMV infection.
- The role of bilirubin fractions (free and conjugated) in an expanded biochemical analysis.
- Evaluation of coagulogram and prothrombin time in viral infections.
- The significance of electrolytes (potassium and calcium) in the general therapeutic blood profile.
- Changes in the leukocyte formula and platelet count in confirmed CMV.
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